Service Categorization schemas in CRM

Hello Everyone,

Can anyone help me with issue: when we activate a new version of the schema, existing tickets still have the old version of the schema. This implies that if you add a field/values in the categorization, you will not be able to select it on documents that were created before the new version was activated.

If i tried to delete the existing schema from the document and try to add,again it is displaying the old version.

Is there an easy solution for this (without having to recreate all those documents)?